-131- Sternidae. Terns. Gygis alba, subspecies. Small white terns with narrow black ring round eyes; bill black. Gygis microrhyncha. Same as above in general color, but smaller; bill slenderer; tail shorter and more rounded; shafts of tail feathers white. In the preceding, the shafts are usually brownish. The G. microrhyncha has been known only from Nukuhiva until a few years ago, when it was recorded (without comment) from Nawodo Island far away. Possibly the Nawodo record was an error; if not, the bird must occur in various intervening sections. Anous stolidus. The Noddy is dark brown or blackish above and below, with the crown grayish to white. Wing 10-11 inches. It runs into various forms throughout its wide range. Megalopterus melanogenys. The lesser Noddy is brown-black or sooty, with the cap grayish white; wing about 9 inches. Procelsterna cerulea, subspecies. General color gray; tail graduated and feathers pointed. In a general way the tails of Anous, Megalopterus and the present genus are alike--graduated, not forked, though they vary in details. Gygis is also similar. Onychoprion fuscatus. Front of forehead white; lores black; mantle black; wing 12 inches. Bill black. Onychoprion lunatus. Front of forehead white; lores black; man- tle dark smoke gray; wing 10.5 inches; bill black.